AX Lightness Ultra 25T tubular road wheelset

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  • Ultra 25T

    King of Mountain with a set weight of a sensational 790 grams.
    For 2017 our shallow tubular rim and best practice model, the Ultra 24T, has completely been reworked. The successor, the ax 25T, now is 25 mm deep and with its width of 20,5 mm boosts a weight of under 200 grams, so that a wheelset weight of 790 grams can be realized.

    The ax 25T omits the integrated logos on the rim and improves its aerodynamical performance thanks to a revised rim shape.
    The stepped and mechanically machined brake track further improves the braking performance even in difficult situations.

    The Ultra 25T is a real climber and King of Mountain as it already has proven with numerous race wins, regardless if Alpine marathon or mountain time trial.

    Despite of its sensationally low weight the Ultra 25T sports outstanding stiffness and stability values that grant it a rider weight limit of 100 kg and not only make it the weapon of choice uphill but just as well also when the road goes down again.


    Specifications - ax Ultra 25T

    Weight (+/- 5 %)790 g/set
    Rimsax 25T, 195 g/piece
    Rim materialFull Carbon
    Tire typeTubular
    Brake typeRim brake
    Rim depth25 mm
    Rim width20.5 mm
    HubsExtralite CyberFront SP / CyberRear SP
    FreehubShimano/Sram, Campagnolo
    SpokesDT Swiss Aerolite, black
    NipplesDT Swiss ProLock hidden, internal
    Spoke tensionfront: 100 kgf, rear driveside: 140 kgf
    Spoke count (f/h)20 / 24
    Field of useRoad
    Rider weight limit100 kg
    Finish3K
    Decalswhite
    Scope of deliveryax Swissstop brake pads

    Axles: front 100mm; rear 130mm

    Laminated spoke holes
    Instead of simply drilling the spoke holes of our rims, we take a different approach with our rims: Every single spoke hole is crafted by hand and reinforced with strategically placed reinforcement patches.
    The advantage is obvious: Where carbon is being drilled, one inevitably also cuts through fibres. A continuous fibre flow however is essential for the material to play its advantages such as the high tensile strength, even more indispensable for nipple holes that are exposed to high spoke tensions. Specifically crafted nipple seats allow an optimal orientation of the nipples and at the same time distribute the occurring forces evenly into the rim bed.

    Independent testing at an university lab has confirmed the performance of this time and labour intensive approach: The rim is capable of withstanding nipple pulling forces of over 5000 N - circa twice as much as the best competitor and more than every hub flange or spoke would be able to endure. As a result our rims do not carry any spoke tension limit!

    Us ourselves we are building our wheels with up to 140 kg of a spoke tension: A guarantor for you to have long-lasting joy with your wheels. The higher the spoke tension, the lesser the opportunity for a spoke to be unloaded upon an overload of the wheels (e.g. from a compression such as an obstacle, pothole or anything alike) and the wheels to therewith come out of true. That way you are longer able to ride with your perfectly trued wheels. As an additional advantage there also is minor increase in stiffness to be recorded.
    An effort that pays off!

    Extralite CyberHubs SP / CeramicSpeed Ceramic-option
    Our Ultra wheelset invariably rely on high performance hubs from Extralite. The Italian lightweights are some of the lightest hubs on the market. An intelligent, elaborate construction by means of FEM-analyses are a guarantor for a high durability, reasonable features such as an adjustable bearing play a high suitability for daily use.

    New for 2017 we optionally offer our Ultra wheels with Ceramic hybrid bearings. As we do not settle with the second best, we only offer the highest quality of bearings from CeramicSpeed. The Danish specialists are renowned as the nonplusultra for years and have wins in about every single race globally available in their palmares.

    Hand-built
    All of our wheelsets are individually built by hand in our manufacture in Creußen, Bayern, to the tightest tolerances and with extremely high spoke tension. We refrain from the use of wheel building machines and invariably trust on the craftsmanship of specially qualified mechanics. The high experience with high-end-material allows a consistently high quality, the tight tolerance in lateral runout and radial runout a perfect runout and therewith a lot of joy with the wheels.
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